In an earlier contribution to this discussion,
Mark wrote:

Hi

got a hinged loft hatch with a push to lock push to unlock retention
mechanism

suggested required as best way to draft proof between hatch and frame

TIA

If you use a rebated frame, the hatch will close against a shoulder all the
way round - and you can use conventional self-adhesive foam strip on it.

As a retro-fit job, you can make a pseudo rebate by fitting some strips of
wood into the frame just above the hatch.
--
Cheers,
Roger
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